2. why does mayella take offense to atticus (both before he starts questioning her and after he starts…

Brief Explanations:

Before questioning, Mayella is likely unused to respectful treatment and Atticus' politeness makes her suspicious. After, she feels attacked as Atticus' questions challenge her false testimony and expose uncomfortable truths about her life and the situation.

Answer:

Before, she's suspicious of his politeness. After, his questions challenge her false - testimony and expose uncomfortable truths.